The truth of the matter is then mate, you haven't got enough rad space there for two components (ideally you want 360 whereas you only have 120).
I can't even see how you could mod the case to fit a bigger rad in, other than to have an external arrangement - and that would even be complicated by the fact that there's no obvious place for it to attach to.
It is a very nice case btw, I just don't think it is suitable for what you are trying to achieve.